JPH09108717A - Clearance setting method for antifriction bearing of backup roll in rolling mill - Google Patents
Clearance setting method for antifriction bearing of backup roll in rolling millInfo
- Publication number
- JPH09108717A JPH09108717A JP26861995A JP26861995A JPH09108717A JP H09108717 A JPH09108717 A JP H09108717A JP 26861995 A JP26861995 A JP 26861995A JP 26861995 A JP26861995 A JP 26861995A JP H09108717 A JPH09108717 A JP H09108717A
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- rolling
- backup roll
- rolling mill
- clearance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Mounting Of Bearings Or Others (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明方法は、圧延機のバッ
クアップロールころがり軸受の間隙設定方法に関するも
のである。特に、オイルミスト潤滑ころがり軸受のコロ
と、軸受内輪外周との間隙設定に好適な設定方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting a clearance for a backup roll rolling bearing of a rolling mill. In particular, the present invention relates to a setting method suitable for setting a clearance between the roller of the oil mist lubricated roller bearing and the outer circumference of the bearing inner ring.
【0002】[0002]
【従来の技術】例えば、連続熱処理設備と圧延機を連設
し、圧延後の鋼帯を熱処理して加工性を付与し、次い
で、圧延により鋼帯の形状矯正を施して製品とするプロ
セスラインの圧延速度は、約800m/分以上の高速圧
延で鋼帯を圧延するため、圧延機のワークロールをバッ
クアップするバックアップロールのころがり軸受には、
全圧延荷重負荷が加わり、しかも高速圧延による軸受潤
滑油の攪拌抵抗による発熱のため、特に、圧延油を用い
ないドライ圧延の場合には、高温による油膜切れのため
軸受が焼き付くことがある。また、圧延精度向上のため
軸受の潤滑方法を従来のモーゴイル潤滑から、オイルミ
スト潤滑に変更した場合は、この軸受での発熱の問題
が、特に顕著になる。このようにバックアップロール軸
受の焼き付きを防止するため、ロールチョック全周を水
冷することが実開昭61−53002号公報に開示され
ている。2. Description of the Related Art For example, a process line in which a continuous heat treatment facility and a rolling mill are provided in series, the rolled steel strip is heat-treated to impart workability, and then the shape of the steel strip is corrected by rolling to obtain a product. The rolling speed of is about 800 m / min or more for rolling the steel strip at high speed, so the rolling bearing of the backup roll that backs up the work roll of the rolling mill is
The total rolling load is applied and heat is generated due to the agitation resistance of the bearing lubricating oil during high-speed rolling. Particularly, in the case of dry rolling without using rolling oil, the bearing may be seized due to oil film breakage due to high temperature. Further, when the lubrication method of the bearing is changed from the conventional mogoyle lubrication to the oil mist lubrication in order to improve the rolling accuracy, the problem of heat generation in this bearing becomes particularly remarkable. Thus, in order to prevent seizure of the backup roll bearing, water cooling of the entire circumference of the roll chock is disclosed in Japanese Utility Model Laid-Open No. 61-53002.
【0003】[0003]
【発明が解決しようとする課題】上記のごとく、水冷に
よってロールチョックを介して、その内部の軸受を冷却
すると、軸受の間隙(クリアランス)は、種々の熱変形
の組合せであり、その設定条件は複雑である。つまり、
軸受潤滑油がロールの高速回転により攪拌されて発熱
し、その発熱による軸受内輪の熱膨張と、ロールチョッ
ク冷却による外輪の熱収縮率の関係把握(推定)が極め
て困難であることから、バックアップロールのころがり
軸受の間隙を適正に設定することが困難であった。この
ようにバックアップロールのころがり軸受の間隙が適正
より狭い場合には、軸受外輪がコロを挟んで軸受内輪を
締め上げることから、軸受外軸が早期にスポーリングを
起こして交換が必要とはり、圧延機の稼働率が低下す
る。またころがり軸受間隙が適正値より広い場合には、
軸受内輪の揺動により正確な圧延荷重を圧延鋼帯に加え
ることが困難になり、高精度圧延が不可能になる等の課
題がある。本発明方法は、このような課題を有利に解決
するためなされたものであり、圧延機のバックアップロ
ールころがり軸受(特に、オイルミスト潤滑ころがり軸
受)の間隙を適正に設定する方法を提供することを目的
とするものである。As described above, when the bearing inside is cooled by water cooling through the roll chock, the clearance (clearance) of the bearing is a combination of various thermal deformations, and its setting conditions are complicated. Is. That is,
The bearing lubricating oil is agitated by the high speed rotation of the rolls to generate heat, and it is extremely difficult to understand (estimate) the relationship between the thermal expansion of the bearing inner ring due to the heat generation and the heat shrinkage rate of the outer ring due to roll chock cooling. It was difficult to properly set the clearance of the rolling bearing. In this way, when the clearance of the rolling bearing of the backup roll is narrower than appropriate, the outer ring of the bearing clamps the inner ring of the bearing by sandwiching the roller, which causes spalling of the outer shaft of the bearing early and requires replacement. The operating rate of the rolling mill is reduced. If the rolling bearing clearance is wider than the appropriate value,
There is a problem that it becomes difficult to apply an accurate rolling load to the rolled steel strip due to the oscillation of the bearing inner ring, and high precision rolling becomes impossible. The method of the present invention has been made in order to advantageously solve such a problem, and provides a method for appropriately setting the gap of a backup roll rolling bearing of a rolling mill (in particular, an oil mist lubricated rolling bearing). It is intended.
【0004】[0004]
【課題を解決するための手段】本発明方法の特徴とする
ところは、圧延機のバックアップロールころがり軸受の
間隙を下記数式に基づき、設定することを特徴とする圧
延機のバックアップロールころがり軸受の間隙設定方
法。 Cp=K ・(Vn ・L ・ WL ・ ν) a ・ Db b ・exp [ −1
/{ L・ Np ・( Q/D p )ab}] 但し K=106 〜107 、a =1/3 〜2/3 、b =4/3 〜5/3 Cp:設定間隙、K:補正定数、Vn:軸回転数、L:軸受幅、
WL :軸受荷重、ν:潤滑油粘度、 Db :軸受平均直
径、Q:冷却水流量、Dp:冷却配管穴径、Np:冷却配管穴
数、a 、b :軸受材質による係数。A feature of the method of the present invention is that the gap of the backup roll rolling bearing of the rolling mill is set based on the following mathematical formula, and the gap of the backup roll rolling bearing of the rolling mill is set. Setting method. Cp = K ・ (Vn ・ L ・ W L・ ν) a・ D b b・ exp [−1
/ {L · N p · ( Q / D p) ab}] where K = 10 6 ~10 7, a = 1/3 ~2 / 3, b = 4/3 ~5 / 3 Cp: setting gap, K : Correction constant, Vn: Shaft speed, L: Bearing width,
W L : Bearing load, ν: Lubricating oil viscosity, D b : Bearing average diameter, Q: Cooling water flow rate, Dp: Cooling pipe hole diameter, Np: Number of cooling pipe holes, a, b: Coefficients depending on bearing material.
【0005】[0005]
【発明の実施の形態】本発明方法の一例を図面によって
説明する。図1において、鋼帯1を上ワークロール2、
下ワークロール2a、上中間ロール3、下中間ロール3
a、上バックアップロール4、下バックアップロール4
aからなる6Hi圧延機5で、上下バックアップロール
チョック6、6aにより上下バックアップロール4、4
aに圧延荷重をかけ、上下中間ロール3、3aを介して
上下ワークロール2、2aにより、連続焼鈍(熱処理)
設備(図示せず)で熱処理後の鋼帯1へ圧延荷重を加え
て連続圧延する。このような圧延機5のバックアップロ
ール4、4aは、図2に示すごとく上下バックアップロ
ールチョック6、6aに対して軸受外輪7にコロ8を配
設し、このコロ8と軸受内輪外周9a(実線)との間隙
10を下記のごとく設定するものである。軸受内輪外周
9aは、バックアップロールの圧延荷重負荷時(圧延
中)の軸受内輪外周9aの位置であり、軸受内輪外周9
b(2点鎖線)は、バックアップロール無負荷時の軸受
内輪外周の位置である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the method of the present invention will be described with reference to the drawings. In FIG. 1, a steel strip 1 is attached to an upper work roll 2,
Lower work roll 2a, upper intermediate roll 3, lower intermediate roll 3
a, upper backup roll 4, lower backup roll 4
In the 6Hi rolling mill 5 consisting of a, the upper and lower backup roll chock 6, 6a
A rolling load is applied to a, and continuous annealing (heat treatment) is performed by the upper and lower work rolls 2 and 2a through the upper and lower intermediate rolls 3 and 3a.
Continuous rolling is performed by applying a rolling load to the steel strip 1 after the heat treatment with equipment (not shown). As shown in FIG. 2, the backup rolls 4 and 4a of the rolling mill 5 have rollers 8 arranged on the bearing outer ring 7 with respect to the upper and lower backup roll chocks 6 and 6a, and the rollers 8 and the bearing inner ring outer circumference 9a (solid line). The gap 10 between and is set as follows. The bearing inner ring outer circumference 9a is the position of the bearing inner ring outer circumference 9a when the rolling load of the backup roll is being applied (during rolling).
b (two-dot chain line) is the position of the outer circumference of the bearing inner ring when the backup roll is unloaded.
【0006】上記のごとき設定間隙は、軸受外輪7の寿
命とコロ8の焼き付きの危険性とのバランスした範囲に
設定するものであり、実測データから上記数式により適
正間隙を設定することを見出したものである。実測デー
タとしては、例えば冷却水温≦50℃、外気温≦50℃
の場合。軸回転数 Vu =374(rpm)、軸受平均直径 Db =
750(mm) 、軸受幅 L=400 (mm)、軸受荷重 WL = (圧延
荷重)/2 =600(t)、冷却水量 Q=40 (l/min)、40℃にお
ける潤滑油粘度ν=460(cst)、冷却配管穴径 Dp =40(m
m)、冷却配管穴数 Np =8( 本 )のとき、設定間隙 Cp
=500(μm)で軸受外輪寿命を50万t 以上圧延できる。こ
のとき、本発明方法による軸受間隙設定式中の軸受材質
による係数a 及びbの値は、a =1/2 、b =1527であっ
た。The above-mentioned set gap is set in a range in which the life of the bearing outer ring 7 and the risk of seizure of the roller 8 are balanced, and it has been found from the actual measurement data that the proper gap is set by the above mathematical formula. It is a thing. As the actual measurement data, for example, cooling water temperature ≤50 ° C, outside air temperature ≤50 ° C
in the case of. Shaft speed Vu = 374 (rpm), bearing average diameter Db =
750 (mm), bearing width L = 400 (mm), bearing load W L = (rolling load) / 2 = 600 (t), cooling water amount Q = 40 (l / min), lubricating oil viscosity at 40 ° C ν = 460 (cst), cooling pipe hole diameter D p = 40 (m
m), when the coolant pipe Bolt N p = 8 of (the), set gap Cp
= 500 (μm), the bearing outer ring life can be rolled by 500,000 tons or more. At this time, the values of the coefficients a and b depending on the bearing material in the bearing clearance setting formula according to the method of the present invention were a = 1/2 and b = 1527.
【0007】次に、上記のごとくコロ8と軸受内輪外周
9aとの間隙を設定したバックアップロールチョック6
により、バックアップロール4に圧延荷重を加えると図
2に示すごとく、上下ロールチョック6、6aにおいて
軸受外輪7のコロ8の一部として角度θ範囲に軸受内輪
外周9a(実線)が接触回転することになり、このθ部
のコロ8が摩擦や潤滑油攪拌抵抗により発熱して高温と
なり、焼き付きが発生する。一方軸受内輪外周9aとの
非接触部コロ8は、発熱はほとんどなく伝熱程度であ
り、θ部に比べ低温となっている。Next, the backup roll chock 6 in which the gap between the roller 8 and the bearing inner ring outer circumference 9a is set as described above.
As a result, when a rolling load is applied to the backup roll 4, as shown in FIG. 2, the bearing inner ring outer periphery 9a (solid line) comes into contact rotation in the angle θ range as a part of the roller 8 of the bearing outer ring 7 in the upper and lower roll chocks 6 and 6a. Then, the roller 8 at the θ portion generates heat due to friction and resistance to stirring of the lubricating oil to reach a high temperature, and seizure occurs. On the other hand, the roller 8 which is not in contact with the outer circumference 9a of the bearing inner ring has almost no heat generation and has a heat transfer level, which is lower than that of the θ portion.
【0008】そこで、コロ8の接触回転が発生する範囲
の上下ロールチョック6、6aの軸受外輪7のみを冷却
することにより、軸受外輪7に接している上下ロールチ
ョック6、6aの軸受外輪7に接触回転して高温となっ
ているコロ8のみを冷却して、焼き付きを防止するとと
もに、軸受内輪外周9a(実線)非接触部の軸受外輪7
(コロ8)との温度差を小さくすることによって、軸受
外輪7全周の熱歪みをなくし、コロ8と軸受内輪外周9
aとの間隙10を設定間隙に保持しつつ、圧延すること
ができる。Therefore, by cooling only the bearing outer ring 7 of the upper and lower roll chocks 6, 6a within the range where the contact rotation of the rollers 8 occurs, the bearing outer ring 7 of the upper and lower roll chock 6, 6a contacting the bearing outer ring 7 is rotated. Then, only the roller 8 having a high temperature is cooled to prevent seizure, and the bearing outer ring 7 of the bearing inner ring outer periphery 9a (solid line) is not contacted.
By reducing the temperature difference between the roller 8 and the roller 8, the heat distortion of the entire circumference of the bearing outer ring 7 is eliminated, and the roller 8 and the outer circumference 9 of the bearing inner ring are eliminated.
Rolling can be performed while maintaining the gap 10 with a at the set gap.
【0009】このような冷却を施す機構としては、例え
ば図示のごとくコロ8に接触回転が発生する範囲の軸受
外輪7の近傍のロールチョック6aに冷却管11を配設
し、この冷却管11へ冷却媒体を通して軸受外輪7を冷
却することができ、冷却媒体としては、水(常温)が最
適である。このように冷却する軸受外輪7の冷却温度と
しては、コロ8の材質等により若干ことなるが、一般に
用いられている材質であれば120℃以下に冷却するこ
とによって、軸受外輪7の材質硬度が低下して塑性変形
することもなく、しかも潤滑油の高温での粘度低下によ
る油膜切れも防止することができる。下限としては、水
冷によって冷却できる限度まで冷却することができる。As a mechanism for performing such cooling, for example, as shown in the figure, a cooling pipe 11 is provided in the roll chock 6a near the bearing outer ring 7 in the range where the contact rotation of the roller 8 occurs, and the cooling pipe 11 is cooled. The bearing outer ring 7 can be cooled through the medium, and water (normal temperature) is optimal as the cooling medium. The cooling temperature of the bearing outer ring 7 to be cooled in this way is slightly different depending on the material of the roller 8 and the like, but if the material is a commonly used material, the material hardness of the bearing outer ring 7 can be reduced by cooling to 120 ° C. or less. It is possible to prevent the oil film from being broken due to a decrease in the viscosity of the lubricating oil at a high temperature, and to prevent the oil film from being broken. As a lower limit, it is possible to cool to the limit that can be cooled by water cooling.
【0010】このようにして、軸受外輪7を冷却するこ
とにより、コロ8の焼き付きを防止するとともに、軸受
外輪7全周の熱歪みをなくし、コロ8と軸受内輪外周9
aとの間隙10を設定間隙に保持しつつ、圧延すること
ができ、鋼帯を高精度で圧延することができる。By cooling the bearing outer ring 7 in this manner, seizure of the roller 8 is prevented, and thermal distortion of the entire circumference of the bearing outer ring 7 is eliminated, so that the roller 8 and the outer circumference 9 of the bearing inner ring are removed.
Rolling can be performed while maintaining the gap 10 with a at the set gap, and the steel strip can be rolled with high accuracy.
【0011】[0011]
【実施例】次に、本発明方法の実施例を比較例とともに
挙げる。EXAMPLES Next, examples of the method of the present invention will be given together with comparative examples.
【表1】 [Table 1]
【0012】注1:軸受内輪とコロとの間隙設定は、前
記数式に基づき設定した。 注2:圧延は、連続焼鈍設備と調質圧延機からなる連続
プロセスラインで、焼鈍後の極低炭素鋼帯(板厚0.6
mm、板幅1000mm)を上記のごとく連続圧延し
た。 注3:圧延ロール径のBUR 径はバックアップロール、BU
R 軸はバックアップロール軸径、IMR 径は中間ロール
径、WR径はワークロール径。 注4:冷却範囲は、ロールチョック全周に占めるコロの
接触回転発生範囲の比率。 注5:設定間隙は、軸受内輪外周とコロとの間隙。 注6:軸受外輪寿命は、○:50 万t以上圧延、△:10 万
〜50万t未満圧延、×:10 万t 未満圧延。 注7:圧延精度は、良: 目標圧延板厚の±0.001mm 以
下、否: 目標圧延板厚の±0.001mm 超。Note 1: The clearance between the inner ring of the bearing and the roller was set based on the above formula. Note 2: Rolling is a continuous process line consisting of continuous annealing equipment and temper rolling mill, and ultra low carbon steel strip after annealing (sheet thickness 0.6
mm, plate width 1000 mm) was continuously rolled as described above. Note 3: BUR diameter of rolling roll is backup roll, BU
The R axis is the backup roll axis diameter, the IMR diameter is the intermediate roll diameter, and the WR diameter is the work roll diameter. Note 4: The cooling range is the ratio of the contact rotation generation range of the roller to the entire circumference of the roll chock. Note 5: The set clearance is the clearance between the outer circumference of the bearing inner ring and the roller. Note 6: Outer ring bearing life is ○: rolled 500,000 t or more, △: rolled 100,000 to less than 500,000 t, ×: rolled less than 100,000 t. Note 7: Rolling accuracy is good: less than ± 0.001mm of target rolling thickness, no: more than ± 0.001mm of target rolling thickness.
【0013】[0013]
【発明の効果】本発明方法によれば、バックアップロー
ル軸受の寿命を著しく延長し、軸受外輪の取り替えによ
る圧延機の稼働率低下を防止して生産性を高めることが
できる。また軸受外輪の寿命延長ができ、修理コストを
大幅に軽減することができる。更に、鋼帯の圧延精度を
向上することができる等の優れた効果が得られる。According to the method of the present invention, the life of the backup roll bearing can be remarkably extended, the operating rate of the rolling mill can be prevented from lowering due to the replacement of the bearing outer ring, and the productivity can be improved. In addition, the life of the bearing outer ring can be extended, and the repair cost can be significantly reduced. Further, it is possible to obtain an excellent effect that the rolling accuracy of the steel strip can be improved.
【図1】圧延機の概要を示す側面図である。FIG. 1 is a side view showing an outline of a rolling mill.
【図2】バックアップロール軸受部の要部正面図であ
る。FIG. 2 is a front view of a main part of a backup roll bearing portion.
Claims (1)
受の間隙を下記数式に基づき、設定することを特徴とす
る圧延機のバックアップロールころがり軸受の間隙設定
方法。 Cp=K ・(Vn ・L ・ WL ・ ν) a ・ Db b ・exp [ −1
/{ L・ Np ・( Q/D p )ab}] 但し K=106 〜107 、a =1/3 〜2/3 、b =4/3 〜5/3 Cp:設定間隙、K:補正定数、Vn:軸回転数、L:軸受幅、
WL :軸受荷重、ν:潤滑油粘度、 Db :軸受平均直
径、Q:冷却水流量、Dp:冷却配管穴径、Np:冷却配管穴
数、a 、b :軸受材質による係数。1. A gap setting method for a backup roll rolling bearing of a rolling mill, wherein the gap of the backup roll rolling bearing of the rolling mill is set based on the following formula. Cp = K ・ (Vn ・ L ・ W L・ ν) a・ D b b・ exp [−1
/ {L · N p · ( Q / D p) ab}] where K = 10 6 ~10 7, a = 1/3 ~2 / 3, b = 4/3 ~5 / 3 Cp: setting gap, K : Correction constant, Vn: Shaft speed, L: Bearing width,
W L : Bearing load, ν: Lubricating oil viscosity, D b : Bearing average diameter, Q: Cooling water flow rate, Dp: Cooling pipe hole diameter, Np: Number of cooling pipe holes, a, b: Coefficients depending on bearing material.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7268619A JP3067985B2 (en) | 1995-10-17 | 1995-10-17 | Method for setting gap of backup roll rolling bearing of rolling mill |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7268619A JP3067985B2 (en) | 1995-10-17 | 1995-10-17 | Method for setting gap of backup roll rolling bearing of rolling mill |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09108717A true JPH09108717A (en) | 1997-04-28 |
JP3067985B2 JP3067985B2 (en) | 2000-07-24 |
Family
ID=17461069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7268619A Expired - Fee Related JP3067985B2 (en) | 1995-10-17 | 1995-10-17 | Method for setting gap of backup roll rolling bearing of rolling mill |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3067985B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107725582A (en) * | 2017-11-16 | 2018-02-23 | 北京海月星科技有限公司 | Water lubriucated bearing and transmission device |
CN108971237A (en) * | 2017-05-31 | 2018-12-11 | 霍尼韦尔国际公司 | Bearing floating for metal rolled application compensates |
-
1995
- 1995-10-17 JP JP7268619A patent/JP3067985B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108971237A (en) * | 2017-05-31 | 2018-12-11 | 霍尼韦尔国际公司 | Bearing floating for metal rolled application compensates |
CN108971237B (en) * | 2017-05-31 | 2022-04-26 | 霍尼韦尔国际公司 | Bearing float compensation for metal rolling applications |
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